Two machines on same feed

[MarkiusSchu]

Hello all, I am working in an industrial plant in Chicago and had a question:
We currently have a 30A fused feed from a panel in an electrical room that feeds out of the room to a machine about 70 feet away. We would like to add another machine next to it. Each of the machines are run only during short (1-5 minute) periods possibly once or twice a day, and we would not need to run both at the same time.
Is it acceptable to use the same feed in this way:
Add a junction box next to the machines with a 3 position selector switch and two contactors (mach.1 - off - mach. 2) to select between the two machines?
It would switch the 480VAC power to fused disconnect motor controls mounted on each machine.

Thanks in advance,
Mark

 

[infinity]

Since the two cannot operate simultaneously you could use the single circuit to feed both machines via the selector switch. Are both machines designed to operate on a 30 amp circuit?

 

[LarryFine]

If your customer has self control, and it won't do damage, I would think you can just use a J-box.

 

[petersonra]

I don't say any reason for the contactors to switch the 480 volt power. Just interlock the selector switch with the e-stop circuits of the two machines so only one of the machines can run at a time. That is all the code would require.

 

[MarkiusSchu]

Thank you everyone. Since they are both designed for 30A feeds, I will set up an interlocked switch.